Brooks Instrument MT3810 - Manual (Page 30)

2-4
Model MT 3810
Installation and Operation Manual
X-VA-MT3810-eng
Part Number: 541B050AHG
June, 2008
Section 2 Installation
2-8 Installation of Model MT 3810 Flowmeter with a Smart Meter Manager Transmitter
with or without Optional Alarms and Pulse Output
a. Install the meter as described in Section 2-4.
b. Transmitter setup is done solely through proper system wiring and
parameter configuration. Common transmitter parameters are set by
Brooks prior to shipment. These parameters, such as flow rate, are set
based on order information, meter configuration or defaults inherent to
the transmitter. If requested when ordering the electronics, all
parameters will be set prior to receiving the unit and no further
configuration will be needed at installation. However, more detailed
configurations as well as on-line monitoring can be done through
standard HART
communication protocol, or can be set using a
Emerson TM Model 275 Hand-held communicator. See Operations
Section 3 for manual programming details.
With a HART protocol compatible transmitter, the digital communication
signals are superimposed on top of the 4-20 mA signal.
Communication of more than just the process variables is possible.
Plants utilizing HART compatible transmitters can increase productivity
by reducing trips to the field, gather data needed to reduce process
downtime, proactively perform maintenance rather than reactively, and
transport data to the field and back to the shop. Also, with the Emerson
Asset Management Solutions
TM software (AMS), information may be
moved from the Model 275 Communicator to your personal computer.
The 2-wire, 4-20 mA analog output provides real-time information on
process flow rate. The 1200 baud, HART communication data is
overlaid and transmitted on the 4-20 mA signal. Refer to Figure 2-2 for
SMM electrical configuration. The float is constructed with an integral
magnet that activates a magnetic sensor that is part of the transmitter.
This same float magnet also drives the mechanical pointer.
The flow rate is scalable by setting independent high and low range
parameters. The Analog Output (AO) transmitter parameters, AO Hi-
Range and AO Lo-Range span the 4-20 mA signal. For example, if flow
rate is normally between 100 and 500 gpm, the AO Hi-Range
parameter is set at 500 and the AO Lo-Range is set at 100. Like other
common parameters, the AO Hi-Range and AO Lo-Range can be set
by Brooks prior to shipment.
c. Microprocessor Transmitter Wiring Connections
Refer to Figures 1-3, 1-4, 1-5 and 1-8 for detailed UL approved wiring
hookup. Figures 2-3 through 2-6 are schematic drawings showing
typical electronic hookups.